Science: Mammalian diving reflex

Mammalian diving reflex: "The mammalian diving reflex is a reflex in mammals which optimizes respiration to allow staying underwater for extended periods of time. It is exhibited strongly in aquatic mammals (seals,[1] otters, dolphins, etc.), but exists in weaker versions in other mammals, including humans, including babies up to 12 months old (see Infant swimming)."

Psychology WotD: Anhedonia

Anhedonia: "In psychology and psychiatry, anhedonia (/ˌænhiˈdoʊniə/ an-hee-doh-nee-ə; Greek: ἀν- an-, "without" and ἡδονή hēdonē, "pleasure") is defined as the inability to experience pleasure from activities usually found enjoyable, e.g. exercise, hobbies, music, sexual activities or social interactions."

History: Sator Square

Sator Square: "The Sator Square (or Rotas Square) is a word square containing a Latin palindrome:

SATOR
AREPO
TENET
OPERA
ROTAS
The five words may be read top-to-bottom, bottom-to-top, left-to-right, or right-to-left."

English WotD: halcyon

halcyon:



Adjective



halcyon (comparative more halcyon, superlative most halcyon)

Pertaining to the halcyon or kingfisher

Calm, undisturbed, peaceful, serene.